Pipe-wrench.



L. RfBLAGKMoRR PIPE WRENCH.

APPLICATION FILED JUNE 5, 1909. 974,020. y Patented oct. 25, 1910.

-ms nanars PETERS caA, wAsHmsroN. r c.

LAWRENCE R. BLACKMORE, OF MCKEEVSPORT, PENNSYLVANIA.

PIPE-WRENCH.

Specification of Letters Patent.

Patented-oet. 25, 1.910.

Application filed .Tune 5, 1909. Serial No. 500,329.

To all whom 'it may concern:

Be it known that I, LAWRENCE R. BLACK- Monn, a citizen of the UnitedStates, and a resident of McKeesport, in the county of Allegheny andState of Pennsylvania, have made certain new and useful Improvements inPipe-Wrenches, of which the following is a specification.

This invention is an improvement in chain pipe wrenches, and consists incertain novel constructions and combinations of parts as will behereinafter described and claimed.

In the drawings Figure 1 is a side view of a wrench embodying myinvention. Fig. 2 is a detail section on about line 2-2 of Fig. l. Fig.3 is a cross section on about line 3-3 of Fig. 1. -F ig. t is a detailside elevation of the inner face of one of the duplex aw sections. Fig.5 is a detail view, partly in section, showing a different form of chainfrom that illustrated in Figs. 1 and 2, and Fig. 6 is a detail side viewof one of the jaw sections showing a supplemental jaw face, and Fig. 7is a detail side view of the wrench head.

The wrench as shown, comprises a han dle A, having at one end a head A,provided with a concave seat A2, and with a stem A3 projecting beyondthe concave seat. This stem is of a width less than the width of thehead A, when the latter is viewed edgewise as shown in Fig. 2, so thatthe portions of the head project laterally beyond the stemA3 and formunbroken seats for the jaw sections B, when the latter are appliedthereto as will be understood from Figs. 1 and 2 of the drawings. I alsoreinforce the head A at the opposite ends of the seat A2 by forming lugsA4 thereon which form abutments for the shoulders B at the ends of theconvex surfaces B2 formed on the inner edges of the jaws B, to coincidewith the seats A2, such shouldered and lug construction increasing thestrength of the parts where strain is exerted in operating the wrench aswill be understood from Fig. 1.

On opposite sides of the stem A3 I provide lateral bosses A5, whichproject in opposite directions and are preferably made of a lengthgreater than the thickness of the connecting links C of the chain, sothat the said bosses will project through the openings C in the links Cand beyond the said links and thus enter sockets in the inner4 faces ofthe jaws B, and operating to reinforce the bolt D in securing the jaws Bupon the head A. This bolt D it will be noticed extends through alinedopenings in the stem A3, and the jaws B and may be secured in anysuitable manner. When the parts are assembled as shown in-Fig's. 1 and2, the bolt D operates to retain the jaws B, and also hold theconnecting links C upon the lateral studs A5 of the stem A3. extendsfrom the connecting links C and may be of the sprocket form shown inFigs. 1, 2 and 3, with the lateral studs E, or it may be of the openlink construction shown at F in Fig. 5. On their inner faces the duplexjaw sections B are provided at their rear edges with seats G rounded asshown in Fig. 3, to receive the ends of links F and notched at Gr withinsaid rounded seats to receive the .ends of the studs E, or the wrenchmay be used with other forms of chain, the links C being the same inboth instances.

The jaws B are provided on their working faces with the teeth B4arranged opposite each other as shown in Figs. 1 and 4c, so the wrenchmay be operated in either direction as may be desired in the practicaluse of the invention.

Manifestly, the wrenches may be made in different sizes to suit the workfor which they are designed, and in making large wrenches I prefer toprovide the jaws with separate jaw faces H as shown in Fig. 6, as thesemay be made of a higher grade of carbon steel the other parts of thejaws being in such instances made of ordinary bar steel, thus reducingthe cost without materially affecting the etliciency of the wrench.

I claim- 1. The wrench herein described comprising a handle providedwith a wrench head having a concave seat, and a stem projecting beyondthe same and provided on its opposite sides with lateral bosses, andwith a transverse opening through the same, a chain having connectinglinks fitting over said bosses, duplex jaw sections fitting at theirinner edges the said concave seat of the wrench head, and provided withsockets receiving the ends vof the lateral bosses of the stem, the saidjaws fitting against the connecting links and retaining the same on thebosses, and a bolt passing through the same and the jaw sections andsecuring the same to the stem, each of said jaw sections The chain beingprovided With opposite toothed faces and having on its inner face at itsrear edge seats for engagement by the chain, and having its rear edgeshouldered t0 engage with 5 the Wrench head at the opposite ends of theconcave seat thereof, all substantially as and for the purposes setforth.

2. The combination of a Wrench head having a stem provided with lateralbosses,

10 a chain having connecting links tting on said bosses, jaw sectionsfitting at their inner faces over the ends of the bosses and retainingthe connecting links thereon, and a bolt securing the jaw sections,substantially as set forth.

LAWRENCE R. BLACKMORE.

Titnesses G. C. BLACKMORE, WM. M. NOBLE.

